Dip and Strike

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Dip

The angle of inclination of a bed with respect to horizontal plane is called amount of dip measured at right angle to strike.
The direction along which inclination of a bed occurs is the direction of dip.
It has amount (magnitude) as well as direction so it is a vector quantity. 
The amount of dip varies from 0° to 90° .

Types of dip

i)  True dip

When the dip is measured along the right angle to the strike it is called true dip. It has always maximum amount of dip between 0° to 90°.

ii) Apparent dip

Along any direction other than true dip is the apparent dip. It is always less than true dip.


Strike

It is the direction of the line of intersection between the bedding plane and the horizontal plane. It has only direction so it is scalar quantity. 
It is horizontal line on the bedding plane.
It has always right angle relationship with the direction of true dip.



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